Tunnel chamber for drying

Abstract

The invention discloses a tunnel type drying chamber, which comprises an oven-drying room (16), a material carriage (8), a primary heat exchanger (6) and an air discharge tube (11). The invention is characterized in that a middle plate (4) is disposed inside the oven-drying room (16) and divides the drying room (16) into a drying room (17) and an air duct (18), a dry hot air port (20), a heating return air port (22) and a heating air outlet port (23) are disposed on the middle plate (4), a partitioning plate (12) is disposed in the air duct (18) close to the heating return air port (22) and divides the air duct (18) into a front air duct and a rear air duct, an air preheater (9), the primary heat exchanger (6) and a primary air blower (5) are disposed inside the front air duct, a secondary heat exchanger (13), a secondary air blower (14) and a steam nozzle (15) are disposed inside the rear air duct, a fresh air inlet port (21) is disposed at the front upper side of the partitioning plate (12), the air preheater (9) is disposed in the front of the fresh air inlet port (21), a moisture-removal blower (10) is disposed on the air preheater (9), and the air discharge tube (11) is disposed on the moisture-removal blower (10). The invention has the advantages of high drying efficiency and low energy consumption.

Description

technical field [0001] The invention relates to a drying device for removing moisture from wet materials, in particular to a tunnel-type drying chamber used in food drying. Background technique [0002] At present, the tunnel-type drying chambers used in the market generally include a drying chamber and a heater. After the air is heated, it exchanges temperature and humidity with the materials in the drying chamber. The high-temperature dry air absorbs the moisture of the materials and then cools down, and the humidity increases. After contacting the material in a cycle, it is directly discharged into the atmosphere, and the material is continuously fed in and out. Since the circulated air is directly discharged into the atmosphere, the heat loss is relatively large. There are also some tunnel-type drying rooms on the market that also use a heater. The air in the drying room is heated by circulation. The air that has been heated many times contacts the material many times. ...

AI Technical Summary

Problems solved by technology

[0002] At present, the tunnel-type drying chambers used in the market generally include a drying chamber and a heater. After the air is heated, it exchanges temperature and humidity with the materials in the drying chamber. The high-temperature dry air absorbs the moisture of the materials and then cools down, and the humidity increases. After contacting the material in a cycle, it is directly discharged into the atmosphere, and the material is continuously in and out. Since the circulated air is directly discharged into the atmosphere, the heat loss is relatively large.

There are also some tunnel-type drying rooms on the market that also use a heater. The air in the drying room is heated by circulation. The air that has been heated many times contacts the material many times. The drying capacity decreases after the amount increases, so this kind of drying room can only use one-time feeding, first cycle heating, and then use the second-stage drying method of replenishing new air and discharging high-humidity air (that is, heating period and exhaust air drying period). The disadvantage of this drying room is that the material cannot be continuously fed in and out, the work efficiency is low, and the heat loss during the exhaust drying period is large.

When the above two kinds of equipment are in normal operation, the drying chamber is in a slightly positive pressure state, which is not conducive to the evaporation and drying of the material moisture. The drying time is long, and the quality of the material decreases with the extension of the drying time.

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